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Schedule of Financial Instruments Carried at Other Than Fair Value (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | $ 308,123,927 |  | $ 277,306,046 |  |
Other investments and policy loans | 70,508,156 |  | 67,955,155 |  |
Restricted assets | 18,935,055 |  | 16,938,122 |  |
Cemetery perpetual care trust investments | 7,276,210 |  | 7,835,721 |  |
Mortgage servicing rights | 3,039,765 |  | 53,060,455 |  | $ 35,210,516
Mortgage servicing rights, estimated fair value | 3,927,877 |  | 68,811,809 |  |
Bank and other loans payable | (161,712,804) |  | (251,286,927) |  |
Future policy benefits and unpaid claims | (889,327,303) |  | (863,274,693) |  |
Residential Mortgage [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 90,290,776 |  | 51,396,172 |  |
Mortgage loans held for investment, estimated fair value | 88,575,293 |  | 55,159,167 |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Residential Mortgage [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 88,575,293 |  | 55,159,167 |  |
Residential Construction [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 172,139,077 |  | 174,691,408 |  |
Mortgage loans held for investment, estimated fair value | 172,139,077 |  | 174,691,408 |  |
Residential Construction [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Residential Construction [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Residential Construction [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 172,139,077 |  | 174,691,408 |  |
Commercial Loan [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 45,694,074 |  | 51,218,466 |  |
Mortgage loans held for investment, estimated fair value | 44,079,537 |  | 51,008,709 |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Commercial Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 44,079,537 |  | 51,008,709 |  |
Mortgage Loans Net [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 308,123,927 |  | 277,306,046 |  |
Mortgage loans held for investment, estimated fair value | 304,793,907 |  | 280,859,284 |  |
Mortgage Loans Net [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Mortgage Loans Net [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Mortgage Loans Net [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) | 304,793,907 |  | 280,859,284 |  |
Policy Loan [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans | 13,095,473 |  | 13,478,214 |  |
Other investments and policy loans, estimated fair value | 13,095,473 |  | 13,478,214 |  |
Policy Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans |  |  |  |  |
Policy Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage loans held for investment (net of allowances for loan losses of $1,970,311 and $1,699,902 for 2022 and 2021) |  |  |  |  |
Policy Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans | 13,095,473 |  | 13,478,214 |  |
Insurance Assignments [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans | 45,332,585 | [1] | 46,946,590 | [2] |
Other investments and policy loans, estimated fair value | 45,332,585 | [1] | 46,946,590 | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans |  | [1] |  | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans |  | [1] |  | [2] |
Insurance Assignments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Other investments and policy loans | 45,332,585 | [1] | 46,946,590 | [2] |
Restricted Assets [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets | 1,731,469 | [3] | 2,732,320 | [4] |
Restricted assets, estimated fair value | 1,731,469 | [3] | 2,732,320 | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets |  | [3] |  | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets |  | [3] |  | [4] |
Restricted Assets [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Restricted assets | 1,731,469 | [3] | 2,732,320 | [4] |
Cemetery Perpetual Care Trust Investments [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments | 1,506,517 | [3] | 1,823,533 | [4] |
Cemetery perpetual care trust investments, estimated fair value | 1,506,517 | [3] | 1,823,533 | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments |  | [3] |  | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments |  | [3] |  | [4] |
Cemetery Perpetual Care Trust Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Cemetery perpetual care trust investments | 1,506,517 | [3] | 1,823,533 | [4] |
Mortgage Servicing Rights [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights | 3,039,765 |  | 53,060,455 |  |
Mortgage servicing rights, estimated fair value | 3,927,877 |  | 68,811,809 |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Mortgage servicing rights | 3,927,877 |  | 68,811,809 |  |
Bank and Other Loans Payable [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable | (161,712,804) |  | (251,286,927) |  |
Bank and other loans payable, fair value | (161,712,804) |  | (251,286,927) |  |
Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable |  |  |  |  |
Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable |  |  |  |  |
Bank and Other Loans Payable [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Bank and other loans payable | (161,712,804) |  | (251,286,927) |  |
Policyholder Account Balances [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (41,146,171) | [5] | (42,939,055) | [6] |
Future policy benefits and unpaid claims, estimated fair value | (42,181,089) | [5] | (35,855,934) | [6] |
Policyholder Account Balances [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Policyholder Account Balances [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Policyholder Account Balances [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (42,181,089) | [5] | (35,855,934) | [6] |
Future Policy Benefits Annuities [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | (106,637,094) | [5] | (107,992,830) | [6] |
Future policy benefits and unpaid claims, estimated fair value | (126,078,031) | [5] | (116,215,717) | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims |  | [5] |  | [6] |
Future Policy Benefits Annuities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Future policy benefits and unpaid claims | $ (126,078,031) | [5] | $ (116,215,717) | [6] |
[1] | Included in other investments and policy loans on the consolidated balance sheets
[2] | Included in other investments and policy loans on the consolidated balance sheets
[3] | Mortgage loans held for investment
[4] | Mortgage loans held for investment
[5] | Included in future policy benefits and unpaid claims on the consolidated balance sheets
[6] | Included in future policy benefits and unpaid claims on the consolidated balance sheets

X
- Definition Cemetery Perpetua lCare Trust Investments + References No definition available. + Details
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- Definition Fair value of cemetery perpetual care trust investments. + References No definition available. + Details
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- Definition Fair value of future policy benefits and unpaid claims. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
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- Definition Fair value of policy and other loans receivable. + References No definition available. + Details
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- Definition Policy and other loans receivable net1. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 + Details
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- Definition The aggregate value of all restricted investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.6(c)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Footnote 11(c))) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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